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Fair value of financial instruments and investments - Convertible senior notes (Details) - 1.50% Convertible senior notes due 2026 - USD ($) | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2019
--- | --- | --- | ---
Long-term debt |  |  |
Interest rate ( as a percent ) | 1.50% |  |
Convertible debt |  |  |
Long-term debt |  |  |
Principal | $ 287,500,000 | $ 287,500,000 | $ 287,500,000
Interest rate ( as a percent ) | 1.50% |  | 1.50%
Convertible debt | Significant other observable inputs (level 2) |  |  |
Long-term debt |  |  |
Fair value of convertible notes | $ 326,200,000 | $ 281,700,000 |

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